<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script>
        var apple1 = 1;
        var apple2 = 2;
        var linshi = apple1;
        console.log(linshi);
        var apple1 = apple2;
        console.log(apple1);
        var apple2 = linshi;
        console.log(apple2);
    </script>
</head>

<body>

</body>

</html>